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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c204c7f7dce79a8e22ca471b1b21b4df06562a443ddc9486afe507431dcdbc54' 
  AND token = 'qMtdzf6jVqT3wDAdlaUkNiYL+E1FpudOYFQp4OpJEXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}